Kyotaro Ichikawa is a disgruntled loner student who is often reading a murder encyclopedia and learning about human anatomy. He fantasizes about murdering his popular classmates, with the beautiful class idol, Anna Yamada, being his prime target. However, when he observes that Anna is rather quirky in her own way, and when she becomes increasingly friendly towards Kyotaro, he gradually warms up to her and they start to become closer.